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Salt Polygons Are Caused by Convection
#4
On the topic of columnar joints, I got to visit the ones at the Gawler Ranges NP in Australia.  They're reddish, and reportedly made of rhyolite.  The largest formation of them, accessible via 4WD track and a short hike, is called The Organ Pipes:

Organ Pipes pics
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RE: Salt Polygons Are Caused by Convection - by Candace66 - 2020-11-25, 07:09 PM

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